Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials

Porous materials are widely used in many heat transfer applications. Modeling porous materials at the microscopic level can accurately incorporate the detailed structure and substance parameters and thus provides valuable information for the complex heat transfer processes in such media. In this stu...

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Autores principales:	Mayssaa Jbeili, Junfeng Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	heat transfer porous media pore-scale modeling boundary condition thermal conductivity porosity Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/36fa733d2cd04667b43380fbe2700d85
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id	oai:doaj.org-article:36fa733d2cd04667b43380fbe2700d85
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spelling	oai:doaj.org-article:36fa733d2cd04667b43380fbe2700d852021-11-25T18:23:27ZEffects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials10.3390/mi121113692072-666Xhttps://doaj.org/article/36fa733d2cd04667b43380fbe2700d852021-11-01T00:00:00Zhttps://www.mdpi.com/2072-666X/12/11/1369https://doaj.org/toc/2072-666XPorous materials are widely used in many heat transfer applications. Modeling porous materials at the microscopic level can accurately incorporate the detailed structure and substance parameters and thus provides valuable information for the complex heat transfer processes in such media. In this study, we use the generalized periodic boundary condition for pore-scale simulations of thermal flows in porous materials. A two-dimensional porous model consisting of circular solid domains is considered, and comprehensive simulations are performed to study the influences on macroscopic thermal conductivity from several microscopic system parameters, including the porosity, Reynolds number, and periodic unit aspect ratio and the thermal conductance at the solid–fluid interface. Our results show that, even at the same porosity and Reynolds number, the aspect ratio of the periodic unit and the interfacial thermal conductance can significantly affect the macroscopic thermal behaviors of porous materials. Qualitative analysis is also provided to relate the apparent thermal conductivity to the complex flow and temperature distributions in the microscopic porous structure. The method, findings and discussions presented in this paper could be useful for fundamental studies, material development, and engineering applications of porous thermal flow systems.Mayssaa JbeiliJunfeng ZhangMDPI AGarticleheat transferporous mediapore-scale modelingboundary conditionthermal conductivityporosityMechanical engineering and machineryTJ1-1570ENMicromachines, Vol 12, Iss 1369, p 1369 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	heat transfer porous media pore-scale modeling boundary condition thermal conductivity porosity Mechanical engineering and machinery TJ1-1570
spellingShingle	heat transfer porous media pore-scale modeling boundary condition thermal conductivity porosity Mechanical engineering and machinery TJ1-1570 Mayssaa Jbeili Junfeng Zhang Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials
description	Porous materials are widely used in many heat transfer applications. Modeling porous materials at the microscopic level can accurately incorporate the detailed structure and substance parameters and thus provides valuable information for the complex heat transfer processes in such media. In this study, we use the generalized periodic boundary condition for pore-scale simulations of thermal flows in porous materials. A two-dimensional porous model consisting of circular solid domains is considered, and comprehensive simulations are performed to study the influences on macroscopic thermal conductivity from several microscopic system parameters, including the porosity, Reynolds number, and periodic unit aspect ratio and the thermal conductance at the solid–fluid interface. Our results show that, even at the same porosity and Reynolds number, the aspect ratio of the periodic unit and the interfacial thermal conductance can significantly affect the macroscopic thermal behaviors of porous materials. Qualitative analysis is also provided to relate the apparent thermal conductivity to the complex flow and temperature distributions in the microscopic porous structure. The method, findings and discussions presented in this paper could be useful for fundamental studies, material development, and engineering applications of porous thermal flow systems.
format	article
author	Mayssaa Jbeili Junfeng Zhang
author_facet	Mayssaa Jbeili Junfeng Zhang
author_sort	Mayssaa Jbeili
title	Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials
title_short	Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials
title_full	Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials
title_fullStr	Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials
title_full_unstemmed	Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials
title_sort	effects of microscopic properties on macroscopic thermal conductivity for convective heat transfer in porous materials
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/36fa733d2cd04667b43380fbe2700d85
work_keys_str_mv	AT mayssaajbeili effectsofmicroscopicpropertiesonmacroscopicthermalconductivityforconvectiveheattransferinporousmaterials AT junfengzhang effectsofmicroscopicpropertiesonmacroscopicthermalconductivityforconvectiveheattransferinporousmaterials
_version_	1718411187358531584

Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials

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